Siemens Simatic S7-300 Specifications Page 79

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S7-300 Automation System CPU Specifications: CPU 31xC and CPU 31x
A5E00105475-03
5-19
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Table 5-12 Process and diagnostic interrupt response times
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CPU 312 0.5 ms 0.8 ms - 0.5 ms 1.0 ms
CPU 312C 0.5 ms 0.8 ms 0.6 ms 0.5 ms 1.0 ms
CPU 313C 0.4 ms 0.6 ms 0.5 ms 0.4 ms 1.0 ms
CPU 313C-2 0.4 ms 0.7 ms 0.5 ms 0.4 ms 1.0 ms
CPU 314 0.4 ms 0.7 ms - 0.4 ms 1.0 ms
CPU 314C-2 0.4 ms 0.7 ms 0.5 ms 0.4 ms 1.0 ms
CPU 315-2 DP 0.4 ms 0.7 ms - 0.4 ms 1.0 ms
CPU 317-2 DP 0.2 ms 0.3 ms - 0.2 ms 0.3 ms
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7KHSURFHVVLQWHUUXSWUHVSRQVHWLPH of signal modules is determined by
following factors:
Digital input modules
Process interrupt response time = internal interrupt preparation time + input
delay
You will find these times in the data sheet for the respective digital input
module.
Analog input modules
Process interrupt response time = internal interrupt preparation time + input
delay
The internal interrupt preparation time for analog input modules can be
neglected. The conversion times can be found in the data sheet for the
individual analog input modules.
The 'LDJQRVWLFLQWHUUXSWUHVSRQVHWLPH of signal modules is equivalent to the
period that expires between the time a signal module detects a diagnostic event
and the time this signal module triggers the diagnostic interrupt. This short time can
be neglected.
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Process interrupt processing begins after process interrupt OB40 is called. Higher-
priority interrupts stop process interrupt processing. Direct I/O access is executed
during runtime of the instruction. After process interrupt processing has terminated,
cyclic program execution continues or further interrupt OBs of equal or lower
priority are called and processed.
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